<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title><%= title %></title>
    <style type="text/css">
        #code
        {
            font-family:Arial;
            font-style:italic;
            font-weight:bold;
            border:0;
            letter-spacing:2px;
            color:blue;
        }
    </style>
    <script type="text/javascript">
        var code ; //在全局定义验证码
        //校验验证码
        function validate(){
            var inputCode = document.getElementById("input").value.toUpperCase(); //取得输入的验证码并转化为大写
            if(inputCode.length <= 0) { //若输入的验证码长度为0
                alert("请输入验证码！"); //则弹出请输入验证码
            }
            else if(inputCode != code ) { //若输入的验证码与产生的验证码不一致时
                alert("验证码输入错误！@_@"); //则弹出验证码输入错误
                createCode();//刷新验证码
                document.getElementById("input").value = "";//清空文本框
            }
            else { //输入正确时
                alert("^-^"); //弹出^-^
            }
        }

        function imageValidate() {
            var inputImageCode  = document.getElementById('image-input').value
            if(verifyCode.validate(inputImageCode)){
                alert("^-^"); //弹出^-^
            } else {
                alert("验证码输入错误！@_@"); //则弹出验证码输入错误
            }
        }

        //产生验证码
        window.onload = function createCode(){
            code = "";
            var codeLength = 4;//验证码的长度
            var checkCode = document.getElementById("code");
            var random = new Array(0,1,2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R',
                'S','T','U','V','W','X','Y','Z');//随机数
            for(var i = 0; i < codeLength; i++) {//循环操作
                var index = Math.floor(Math.random()*36);//取得随机数的索引（0~35）
                code += random[index];//根据索引取得随机数加到code上
            }
            checkCode.value = code;//把code值赋给验证码

            // 图片验证码生成
            function getGVerify(id)
            {

                function GVerify(options) { //创建一个图形验证码对象，接收options对象为参数
                    this.options = { //默认options参数值
                        id: "", //容器Id
                        canvasId: "verifyCanvas", //canvas的ID
                        width: "100", //默认canvas宽度
                        height: "30", //默认canvas高度
                        type: "blend", //图形验证码默认类型blend:数字字母混合类型、number:纯数字、letter:纯字母
                        code: ""
                    }

                    if(Object.prototype.toString.call(options) == "[object Object]"){//判断传入参数类型
                        for(var i in options) { //根据传入的参数，修改默认参数值
                            this.options[i] = options[i];
                        }
                    }else{
                        this.options.id = options;
                    }

                    this.options.numArr = "0,1,2,3,4,5,6,7,8,9".split(",");
                    this.options.letterArr = getAllLetter();

                    this._init();
                    this.refresh();
                }

                GVerify.prototype = {
                    /**版本号**/
                    version: '1.0.0',

                    /**初始化方法**/
                    _init: function() {
                        var con = document.getElementById(this.options.id);
                        var canvas = document.createElement("canvas");
                        /*this.options.width = con.offsetWidth > 0 ? con.offsetWidth : "100";
                        this.options.height = con.offsetHeight > 0 ? con.offsetHeight : "30";*/
                        canvas.id = this.options.canvasId;
                        canvas.width = this.options.width;
                        canvas.height = this.options.height;
                        canvas.style.cursor = "pointer";
                        canvas.innerHTML = "您的浏览器版本不支持canvas";
                        con.appendChild(canvas);
                        var parent = this;
                        canvas.onclick = function(){
                            parent.refresh();
                        }
                    },

                    /**生成验证码**/
                    refresh: function() {
                        this.options.code = '';
                        var canvas = document.getElementById(this.options.canvasId);
                        if(canvas.getContext) {
                            var ctx = canvas.getContext('2d');
                        }
                        ctx.textBaseline = "middle";

                        ctx.fillStyle = randomColor(180, 240);
                        ctx.fillRect(0, 0, this.options.width, this.options.height);

                        if(this.options.type == "blend") { //判断验证码类型
                            var txtArr = this.options.numArr.concat(this.options.letterArr);
                        } else if(this.options.type == "number") {
                            var txtArr = this.options.numArr;
                        } else {
                            var txtArr = this.options.letterArr;
                        }

                        for(var i = 1; i <= 4; i++) {
                            var txt = txtArr[randomNum(0, txtArr.length)];
                            this.options.code += txt;
                            ctx.font = '30px SimHei';
                            //ctx.font = randomNum(this.options.height/2, this.options.height) + 'px SimHei'; //随机生成字体大小
                            ctx.fillStyle = randomColor(50, 160); //随机生成字体颜色
                            /* ctx.shadowOffsetX = randomNum(-3, 3);
                            ctx.shadowOffsetY = randomNum(-3, 3);*/
                            ctx.shadowBlur = randomNum(-3, 3);
                            ctx.shadowColor = "rgba(0, 0, 0, 0.3)";
                            var x = this.options.width / 5 * i;
                            var y = this.options.height / 2;
                            var deg = randomNum(-30, 30);
                            /**设置旋转角度和坐标原点**/
                            ctx.translate(x, y);
                            ctx.rotate(deg * Math.PI / 180);
                            ctx.fillText(txt, 0, 0);
                            /**恢复旋转角度和坐标原点**/
                            ctx.rotate(-deg * Math.PI / 180);
                            ctx.translate(-x, -y);
                        }
                        /**绘制干扰线**/
                        for(var i = 0; i < 4; i++) {
                            ctx.strokeStyle = randomColor(40, 180);
                            ctx.beginPath();
                            ctx.moveTo(randomNum(0, this.options.width/2), randomNum(0, this.options.height/2));
                            ctx.lineTo(randomNum(0, this.options.width/2), randomNum(0, this.options.height));
                            ctx.stroke();
                        }
                        /**绘制干扰点**/
                        for(var i = 0; i < this.options.width/4; i++) {
                            ctx.fillStyle = randomColor(0, 255);
                            ctx.beginPath();
                            ctx.arc(randomNum(0, this.options.width), randomNum(0, this.options.height), 1, 0, 2 * Math.PI);
                            ctx.fill();
                        }
                    },

                    /**验证验证码**/
                    validate: function(code){
                        var verifyCode = code.toLowerCase();
                        var v_code = this.options.code.toLowerCase();
                        if(verifyCode == v_code){
                            return true;
                        }else{
                            return false;
                        }
                    }
                }

                /**生成字母数组**/
                function getAllLetter() {
                    var letterStr = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
                    return letterStr.split(",");
                }
                /**生成一个随机数**/
                function randomNum(min, max) {
                    return Math.floor(Math.random() * (max - min) + min);
                }
                /**生成一个随机色**/
                function randomColor(min, max) {
                    var r = randomNum(min, max);
                    var g = randomNum(min, max);
                    var b = randomNum(min, max);
                    return "rgb(" + r + "," + g + "," + b + ")";
                }

                return new GVerify(id);
            }

            var verifyCode = new getGVerify('BOX');
            window.verifyCode = verifyCode

            document.getElementById('demoValidate').onclick = function(verifyCode){
                var inputImageCode  = document.getElementById('image-input').value
                if(window.verifyCode.validate(inputImageCode)){
                    alert("^-^"); //弹出^-^
                } else {
                    alert("验证码输入错误！@_@"); //则弹出验证码输入错误
                }

            }
        }

    </script>
</head>
<body>
    <div>
        <h1><%= title %></h1>
        <hr>
        <input type = "text" id = "input"/>
        <input type = "button" id="code" onclick="createCode()"/>
        <input type = "button" value = "验证" onclick = "validate()"/>
        <hr>
        <h3>图片验证码</h3>
        <hr>
        <input type="text" id="image-input">
        <div id="BOX"></div>
        <input type="button" value="验证" id="demoValidate">
    </div>
    <script type="text/javascript">
    </script>
</body>
</html>